ubuntu20.04 关闭升级提示

在界面下可以关掉自动升级，但是，每次还是会弹出升级提示，解决方法：

sudo systemctl disable apt-daily.service apt-daily-upgrade.service
sudo systemctl disable apt-daily.timer apt-daily-upgrade.timer
sudo systemctl stop apt-daily.service apt-daily-upgrade.service
sudo systemctl stop apt-daily.timer apt-daily-upgrade.timer

此方法不起作用！！！